I've been using the Photomatrix for about 2 mo now. A lot of my pictures are along the coast just at sunrise/sunset and if I want to catch an image that is backlit by the water or the brightening sky, first I will try to get my best exposure based on the average, then I will change the camera setting to take 3 raw images +/- 2 EV. That allows me to catch the details of the foreground object and the details of the sky.
I set the top bars of strength and color saturation in the tonemapping section to the middle, but the light smoothing to very high. Most of the time I don't have to do much adjustments to those and then will tweak the other settings, I have gone back into Lightroom or Elements and continued to tweak the image but for most I don't need to do that.
Here is a recent example form this past weekend that I processed this week. Not the best but shows what I was writing about